which implies that for \(\Delta _V \simeq 1\)  the \(Z^\prime \) -boson mass
\(M_{Z^\prime }\)  should be larger than around \(3 \times 10^4 \, {\rm TeV}\) ,
because otherwise one would be in conflict with the experimental bounds
on kaon mixing. In view of this result it should be clear that in
order to allow for interesting LHC phenomenology, one has to require
that the simplified model is MFV. In our toy model (REF ) this is
simply achieved by setting \(\Delta _V =0\) . We finally add that for very
light mediators important constraints on simplified models can however
still arise from quark-flavor physics even if their interactions are MFV
(see [1]} for a recent comprehensive discussion).
